Purpose/Aim
In order to meet the requirements of digital transformation of new power system and realize the transparency and visualization of internal characteristics of equipment, Digital twin technology has been widely put forward in the field of equipment design, manufacturing, operation and maintenance. However, because of the slow calculation speed of traditional finite element algorithm under the condition of multi-physical field coupling, it can’t meet the requirements of real-time. Therefore, further research on high-precision fast calculation method for electro-thermal coupling is important so that it can provide support for engineering application.
Experimental/Modeling methods
The simulation model of GIL electro-thermal coupling temperature field is constructed by using the traditional finite element method, and the temperature field distribution under different working conditions is obtained. Through sampling test, the input data set of fast calculation method is obtained. On this basis, the principal component analysis method is used to reduce the model parameters, and the fast calculation model of GIL temperature field is obtained by response surface fitting.
Results/Conclusions
Compared with the finite element method, the error of each node of temperature field distribution obtained by fast calculation model can be kept in a low range. The calculation speed is only at the millisecond level, which greatly improves the efficiency compared with the finite element algorithm which needs several hours of calculation time. The research results can provide reference for the fast calculation of multi-physical field for power equipment.
 

GIL; fast calculation method; electro-thermal coupling;